EE101_Lecture02

EE101_Lecture02 - Lecture 2 Fundamentals of Electrical...

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Unformatted text preview: Lecture 2 Fundamentals of Electrical Engineering Course Website Course website: http://www.soe.ucsc.edu/classes/ee101/Winter10/ User Name: ee101 password: OTc0MT Lecture slides and homework will be posted on the website Introduction 1 . Define current, voltage, and power, including their units. 2 . Calculate power and energy, as well as determine whether energy is supplied or absorbed by a circuit element. 3 . State and apply basic circuit laws. 4 . Solve for currents, voltages, and powers in simple circuits. Electrical Current Electrical current is the time rate of flow of electrical charge through a conductor or circuit element. The units are amperes (A), which are equivalent to coulombs per second (C/s). Electrical Current Direct Current Alternating Current When a current is constant with time, we say that we have direct current , abbreviated as dc. On the other hand, a current that varies with time, reversing direction periodically, is called alternating current , abbreviated as ac. . Voltages The voltage associated with a circuit element is the energy transferred per unit of charge that flows through the element. The units of voltage are volts (V), which are equivalent to joules per coulomb (J/C). downhill: resistor uphill: battery...
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EE101_Lecture02 - Lecture 2 Fundamentals of Electrical...

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